High-Power 638-nm AlInGaP Broad Area Laser Diode and its Reliability

Laser based displays have gathered much attention, and they are expected to make an alternative huge market for visible laser diodes (LDs), because only the displays may have a wide color gamut which can express ITU-R BT.2020. Single panel spatial light modulator (SLM) type projectors using broad area (BA) LDs for light sources are most popular so far, and multi-panel ones have started to spread especially for high luminosity. The laser light source for the projector consists of red, green and blue color LDs or blue LD + yellow phosphor (+ red LD). Common requests for the LDs are highly-reliable high-power operation at high case temperature.